Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 37 - Relativity - Problems - Page 1152: 100a

Answer

$v = 2 c$ The relative velocity of recession greater than $c$

Work Step by Step

We can use the classical Doppler equation to find the relative recession speed: $v = \frac{\lambda-\lambda_0}{\lambda_0}~c$ $v = \frac{3\lambda_0-\lambda_0}{\lambda_0}~c$ $v = \frac{2\lambda_0}{\lambda_0}~c$ $v = 2 c$ The relative velocity of recession is greater than $c$
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